Exports at full 1080 resolution. Keep the headline to about six words so it holds up in a feed.
Answer three questions and it fills in the headline, the supporting line, the button, the tag row and the social post, then finds a photograph to go behind them. It all arrives as ordinary text in the steps below, so it is a first draft you edit rather than a result you are stuck with.
Free with an account: 3 a day. Everything else here works signed out, including export.